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YC companies founded by ex-SpaceX people

45 Y Combinator companies with a founder who worked at SpaceX before.

Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.

Hiring the mostlast 60 days
244 roles
Relativity SpaceW16
  1. 2Beyond Reach Labs5
  2. 3Farcast3
See all 9
Fastest growingteam, 6 months
+71%
Airhart AeronauticsS22
  1. 2Raindrop+58%
  2. 3Starcloud+57%
See all 10
Shrinkingteam, 12 months
−13%
PicnicAIS14
  1. 2Jupiter−9%
See all 2
Raised the mostlast 12 months
$250M
StarcloudS24
  1. 2Singularity$80M
  2. 3Turion Space$75M
See all 9
Companies
45
Active
43
Hiring, last 60 days
9
Open roles, 60 days
264
People on these teams
3,290
Showing 45 of 45 companies
CompanyBatchTeam6 mo12 moOpen rolesTotal raisedLast round
Building humanity’s multiplanetary future.
W162,015+6%+20%244$1.4BSeries F$20M, Nov 2023
Intelligence to accelerate human health.
S14306−15%−13%YC$97MSeries C$60M, Jun 2022
Turning space into a transportation layer for Earth
S21131+20%+30%3$54.3MSeries A$44M, Nov 2024
We Mine Asteroids
W2272−4%+11%YC$55.8MUndisclosed round$216K, Oct 2025
Robots for longer-lasting, better-tasting fish at scale.
W2271+25%+78%0$28MSeries A$22M, Jun 2025
Data centers in space
S2466+57%+128%YC$444MSeries A$250M, Aug 2026
Building and Protecting an Exciting Future
S2362  0$80MSeries A$80M, Jul 2026
AppLovin for the food & CPG
S1951−2%−9%0$8MSeed$5.3M, Apr 2023
Vori is a modern operating system for supermarkets
W2048−27%+7%YC$32.1MSeries B$22M, May 2026
AI-Powered ERP, MES, and Test Software for Complex Operations
S2142+27%+45%YC$18.8MSeries A$15M, Jun 2022
Sentry for AI Agents
W2419+58%+138%2$15MSeries A$15M, Sep 2026
We build advanced satcom user terminals
W2019+12%+36%3$23.6MCorporate round$10M, Nov 2025
AI Driven EPC - Weld Fabrication Contractor
X2518+29%+157%1SeedJun 2025
Autonomous construction on Earth and beyond
S2615+15%+50%2$4.5MYC investment$500K, Aug 2026
Automating Office Work for Residential Contractors.
S2414 +8%YC$500KYC investment$500K, Jan 2025
Space solar arrays that grow to the size of a football field in orbit
W2612  5$10.5MSeed$10M, Jul 2026
Airplanes anyone can fly
S2212+71%+140%YC$4.6MUndisclosed round$4.6M, Oct 2025
Agent-Driven Engineering
W2411 +22%YC$5.6MSeed$5.6M, Dec 2025
Modernizing Chip Manufacturing Infrastructure
S268−11% 0$500KYC investment$500K, Jun 2026
AI operating system for mega-scale satellite networks.
W267  2$6.5MGrant$6.5M, Apr 2026
Strength Tracking Wearable
W266  YC
AI agents for on-call
F256  YC$5.5MSeed$5M, Mar 2026
AI-powered insurance claims review
S256  YC
Firmware in minutes, not months - rigorously tested on real hardware
S2560% YC$500KYC investment$500K, Jan 2026
S246−14% 0$500KYC investment$500K, Sep 2024
Employee security done for you.
W2360%−14%0$3.6MSeed$3.5M, Jun 2023
Prime Lightworks Inc. manufactures electric propulsion systems for…
S1650%0%0$1.2MEquity crowdfunding$24K, Apr 2023
Superintelligent space Robots
W264  YC$100KYC investment$100K, Mar 2026
AI for account management and customer success
S254  YC$500KYC investment$500K, Sep 2025
Firmware cybersecurity
S234−20%−20%YC$3MSeed$3M, Sep 2023
Real-time generative AI
W234  0$500KYC investment$500K, Apr 2023
AI that runs factories.
S263  0$500KYC investment$500K, Jun 2026
The fastest and cheapest way to use AI with ITAR or CUI data.
F243  YC
Long range, battery electric vertical take-off and landing aircraft.
W20Acquired3  0$6.3MUndisclosed round$2.3M, Jan 2023
RF test equipment for next-gen spacecraft, drones, and cellphones
X262  YC
We're building robot birds for surveillance.
X262  0
The sensitive data redaction layer for AI
F252  0$500KYC investment$500K, Dec 2025
Fusion reactors for ships
W252  YC$5MSeed$4.5M, Nov 2025
Quick-turn bent tube shop for aerospace, energy, industrials
F242  0$500KYC investment$500K, Dec 2024
Help Institutional Investors manage, track & query their Excel models
S242  0$500KYC investment$500K, Jan 2026
AI automated prior-auths for private medical practices
W261  0$500KYC investment$500K, Mar 2026
AI Agents for Complex Engineering Projects
W251  YC$500KYC investment$500K, Mar 2025
Moving Things Around in Space, Imaging Space Objects When We're Not
S21211  2$128MSeries B$75M, Apr 2026
Improve your appearance by measuring, understanding, and tracking…
F25  YC
Autonomous ground stations for drones
S15Inactive  0$870KSeed$750K, May 2016

How this works

1. The roster

Every launched company in YC's public directory, with its batch, status, industry and location. New companies show up the week YC lists them.

2. The numbers

Each company is matched to Crustdata by its website. Crustdata adds team size and its change over 6 and 12 months, open roles from job postings, reported funding, and founders' past employers.

3. The lists

Hiring the most counts distinct roles posted in the last 60 days. Growth needs 10+ people today, shrinking 20+ a year ago, so tiny teams do not top the lists. Rebuilt every week.

Built with Crustdata. Get your own API key and build your own.

The numbers on this page come from three Crustdata API calls. Crustdata tags 5,000+ companies with Y Combinator as an investor; swap the filter for any investor, industry or headcount range and track your own list, with founders' work emails one call away.

  • Company search for team size, growth and funding
  • Job search with a count by company, for who is hiring and for what
  • A watch that re-runs the search weekly and sends only what changed
# 1. every company with Y Combinator as an investor
curl https://api.crustdata.com/company/search \
  -H "authorization: Bearer $CRUSTDATA_API_KEY" \
  -H "x-api-version: 2025-11-01" \
  -d '{
    "filters": { "field": "funding.investors",
                 "type": "in", "value": ["Y Combinator"] },
    "fields": ["basic_info.name",
      "headcount.total", "headcount.growth_percent",
      "funding.total_investment_usd"],
    "limit": 100
  }'

# 2. open listings per company, last 60 days (limit 0 = counts only)
curl https://api.crustdata.com/job/search \
  -H "authorization: Bearer $CRUSTDATA_API_KEY" \
  -H "x-api-version: 2025-11-01" \
  -d '{
  "filters": { "op": "and", "conditions": [
    { "field": "company.basic_info.company_id",
      "type": "in", "value": [...] },
    { "field": "metadata.date_added",
      "type": "=>", "value": "2026-08-24" } ]},
  "limit": 0,
  "aggregations": [{ "type": "group_by",
    "field": "company.basic_info.company_id", "agg": "count" }]
}'

# 3. the same company filter as a weekly watch: POST /watch/company/search

Questions about ex-SpaceX founded YC companies

How many ex-SpaceX founded YC companies are there?

45 Y Combinator companies have a founder who worked at SpaceX; 43 are active.

Which ex-SpaceX founded YC companies are hiring?

9 companies posted roles in the last 60 days, led by Relativity Space (244 roles), Beyond Reach Labs (5 roles) and Farcast (3 roles). 26 mark themselves as hiring on YC's directory.

Which ex-SpaceX founded YC companies are growing fastest?

By team growth over 6 months (10+ people): Airhart Aeronautics (+71%), Raindrop (+58%) and Starcloud (+57%).

Which ex-SpaceX founded YC companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Starcloud ($250M), Singularity ($80M) and Turion Space ($75M).

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